Atomic Axles are available now as bolt-in kits for Jeep JK and TJ. An axle kit for the Toyota FJ Cruiser is in development.
http://www.atomicaxles.com/index.php
The current Xtreme 4x4 TV project JK uses an Atomic Axle set. To help counter people's suspicions that the inner CV units might not be strong enough, the folks on the TV show said the CV units are the same as used by Porsche for the 930 turbo, and by racing buggies with V8 engines. A megabuck Baja 1000 race team wouldn't use a driveline component with questionable durability.
The advantage of the Atomic Axle approach is that you gain the same ground clearance under the differential with the Atomic Axles on 37 inch tires as you would using the Dana 60 with 42 inch tires. The cost is about the same as a new Dana 60 set.
Atomic Axles appeared at SEMA last year, but I don't see them listed this year.